CN108923383B - Overheat protection circuit of USB Type-C connector and overheat protection method thereof - Google Patents
Overheat protection circuit of USB Type-C connector and overheat protection method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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Abstract
The invention discloses a novel overheat protection circuit of an USB Type-C connector and an overheat protection method thereof, wherein the overheat protection circuit comprises a first protection unit and a second protection unit, the structure of the first protection unit is symmetrical to that of the second protection unit, and the first protection unit and the second protection unit are respectively integrated on a first PCB and a second PCB at the port of the Type-C connector. According to the invention, the specification of the USB Type-C system is utilized, when the interface temperature of the USB Type-C connector is too high, the connection condition between the power supply and the equipment is changed through the control chip, so that the system automatically cuts off a power supply loop, and the purpose of overheat protection is achieved, and the USB Type-C connector is simple, reliable and high in practicability; no extra pressure drop is generated on the USB Type-C connecting line, and the system efficiency is high; the protection unit has simple structure, small volume, low cost and easy integration, and does not need to use a high-voltage power tube.
Description
Technical Field
The present invention relates to an overheat protection circuit and an overheat protection method thereof, and more particularly to an overheat protection circuit of an USB Type-C connector and an overheat protection method thereof.
Background
The USB Type-C connector widely applied to electronic products such as mobile phones, notebooks, digital cameras and the like is strongly touted by developers and users through excellent performance and slim design. The Type-C connector conforming to the USB 3.1 standard has the advantages of double-sided pluggable, one-port multi-purpose (power supply, USB transmission and VGA/HDMI), high transmission speed (up to 10 Gbps), slim interface socket design (8.3 mm multiplied by 2.5 mm), high power transmission capacity (up to 100W) and the like. And the Type-C connector can reach 20V/5A in power supply capacity when being used as a charging connector, so that the requirement of rapid charging of portable equipment with continuously increased battery capacity is met. The USB Type-C connector can not only carry out high-speed data transmission, but also realize quick charging of a power supply.
However, although the Type-C connector has many advantages such as a strong power supply capability, the connector interface socket has a small size and a narrow pitch of pins, and when the peripheral elements are damaged, the environment is wet, the metal is aged and deformed, and the pins are bent due to external pressure, V BUS and GND of the circuit board are shorted. If the high-current charging is performed at this time, the heat generated by the circuit board can directly cause the circuit board to burn out. Even if short circuit does not occur, the Type-C interface can be heated and burned due to abrasion or the fact that the charging current passing through the Type-C connector is large when the contact resistance of the Type-C interface is abnormal due to foreign matters. When the heating problem occurs, the charging loop needs to be cut off in time to avoid the occurrence of the situation, but when the port is overheated, the equipment end and the power supply end cannot be directly detected, so that the terminal is burnt or even fires.
For the above problems, there is a solution that an over-temperature protection device is installed on a port of an USB Type-C connector, and a current loop is cut off when a temperature abnormality is detected. The temperature protection device can be mini-Breaker, PPTC or a control chip matched with a high-voltage power switch and a thermistor for use. The mini-Breaker and the PPTC are usually connected in series on a Vbus line when in use, wherein the mini-Breaker is a recoverable temperature control switch which is triggered when temperature abnormality occurs, and the power supply is cut off until the temperature is recovered to be normal, and the temperature control switch is automatically recovered; PPTC, also known as a self-healing fuse, operates similarly to a temperature controlled switch, but is more advantageous in terms of volume and cost. However, the biggest drawback of using mini-Breaker and PPTC is the large voltage drop that can reduce the charging efficiency of the power supply during normal operation. In order to improve the power conversion efficiency, a control chip matched with a high-voltage power switch and a thermistor for overheat protection can be added at the interface of the USB Type-C connector, as shown in fig. 1. During charging, the high-voltage power tube M1, the high-voltage power tube M2 at the first port and the high-voltage power tube M3 and the high-voltage power tube M4 at the second port are all opened, when the temperature of the first port or the second port is too high, the chip controls the high-voltage power tube M1, the high-voltage power tube M2 or the high-voltage power tube M3 and the high-voltage power tube M4 at the first port or the second port to be closed, and the power supply is cut off. Even though the conduction voltage drop of the used MOS tube can be very low, because of the symmetry of the structure of the USB Type-C connecting wire, the current flow directions in two non-directional directions need to be met, so that each port needs to be controlled by a double tube to ensure that the current on the power line is completely cut off when the power line is overheated, and meanwhile, the control chip is always electrified, and therefore, 4 high-voltage power tubes and 2 thermistors need to be used simultaneously when the scheme is adopted for overheat protection, and therefore, the voltage drop is still very large, the loss is high, and the cost is also higher.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the overheat protection circuit of the USB Type-C connector, so that overheat protection of the connector terminal is realized, and the overheat protection circuit is simple and reliable, easy to integrate and high in practicability; no temperature control switch or self-recovery fuse is connected in series on the V BUS power line, no extra voltage drop is generated on the V BUS line, and the efficiency is high; high-voltage power tubes and the like are not needed, and the circuit cost is low.
The invention solves the technical problems by the following technical scheme:
The invention discloses an overheat protection circuit of an USB Type-C connector, which is characterized by comprising a first protection unit and a second protection unit, wherein the structure of the first protection unit is symmetrical to that of the second protection unit, the first protection unit and the second protection unit are respectively integrated on a first PCB (printed Circuit Board) at a first port and a second PCB at a second port of the USB Type-C connector, the first protection unit and the second protection unit are both connected with a channel configuration line of the USB Type-C connector, and the first protection unit and the second protection unit are used for detecting the temperature of the first port and the temperature of the second port distributed at two ends of the Type-C connector;
The first protection unit includes first control chip, first resistance and first thermistor, the second protection unit includes second control chip, second resistance and second thermistor, first thermistor with second thermistor is used for surveying the temperature of Type-C connector the first port with the temperature of second port, wherein:
One end of the first thermistor, one end of the second thermistor, a power end of the first control chip and a power end of the second control chip are all connected with the V BUS power line of the Type-C connector, one end of the first resistor, one end of the second resistor, a grounding end of the first control chip and a grounding end of the second control chip are all grounded, a temperature detection end of the first control chip is connected with the other end of the first resistor and the other end of the first thermistor in parallel, a voltage control end of the first control chip is connected with a channel configuration line of the first port, a temperature detection end of the second control chip is connected with the other end of the second resistor and the other end of the second thermistor in parallel, and a voltage control end of the second control chip is connected with the channel configuration line of the second port;
The first control chip and the second control chip are powered by a V BUS power line of the Type-C connector, and the power supply voltage range is 3.3V-21V; the voltage control end of the first control chip and the voltage control end of the second control chip are used for outputting channel voltage for the channel configuration line, and the channel voltage is greater than 2.75V.
Preferably, the first control chip includes an amplifier, a comparator, a low-voltage MOS tube, a third resistor and a fourth resistor, wherein the in-phase end of the amplifier is connected with an internal reference voltage, the reference voltage is used for comparing with a temperature sampling signal, the output end of the amplifier is connected with the inverting end of the amplifier and the drain electrode of the low-voltage MOS tube in parallel, the inverting end of the comparator is connected with one end of the third resistor and one end of the fourth resistor in parallel, the in-phase end of the comparator is connected with the temperature detection end of the first control chip, the output end of the comparator is connected with the gate electrode of the low-voltage MOS tube, the other end of the third resistor is connected with the power end of the first control chip, the other end of the fourth resistor is connected with the ground end of the first control chip, the source electrode of the low-voltage MOS tube is connected with the voltage control end of the first control chip, and the second control chip has the same structure as the first control chip.
Preferably, when there is a eMarker chip at the usv Type-C connector port, the first protection unit or the second protection unit may also be integrated on a eMarker chip.
The overheat protection method adopting the USB Type-C connector overheat protection circuit is characterized by comprising the following steps of:
connecting a power supply and electronic equipment to the first port and the second port of the USB Type-C connector overheat protection circuit respectively, so that a voltage exists on the second VBUS power line, and continuously detecting the feedback voltage of the second port by a channel configuration line of the first port to ensure that the electronic equipment is in an access state;
When the temperature of a first port connected with the power supply rises, the temperature detection end of the first control chip acquires a first voltage value at two ends of the first resistor, compares the acquired first voltage value with a first preset voltage value, and outputs an interference voltage to the channel configuration line of the first port when the first voltage value exceeds the first preset voltage, so that the feedback voltage of the second port is larger than the suspension voltage of the channel configuration line of the first port, and when the channel configuration line of the first port detects the suspension voltage, the first port generates an action of removing the power supply, thereby realizing overheat protection;
when the temperature of the second port connected with the electronic device rises, the temperature detection end of the second control chip obtains a second voltage value at two ends of the second resistor, compares the obtained second voltage value with a second preset voltage value, when the second voltage value exceeds the second preset voltage, the voltage control end of the second control chip outputs an interference voltage to the channel configuration line of the second port, so that the feedback voltage of the second port is larger than the suspension voltage of the channel configuration line of the first port, and when the channel configuration line of the first port detects the voltage, the electronic device is judged to be disconnected, and the first port generates the action of removing the power supply, thereby realizing overheat protection.
Preferably, when overheat protection is performed, the access waiting time and the judging time of the USB Type-C connector generate a protection hysteresis control so as to avoid rapid disconnection of the charging process, thereby reducing the temperature of the first port and the temperature of the second port connected with the USB Type-C connector.
The invention has the positive progress effects that:
According to the invention, only the control chip and the NTC (Negative Temperature Coefficient ) thermistor are adopted, and when the interface temperature of the Type-C connector is too high by utilizing the specification of the Type-C system, the connection condition between the power supply and equipment is changed through the control chip, so that the system automatically cuts off a power supply loop, thereby achieving the purpose of overheat protection, and being simple and reliable and high in practicability; no extra pressure drop is generated on the Type-C connecting line, and the system efficiency is high; the protection unit has simple structure, small volume, low cost and easy integration, and does not need to use a high-voltage power tube.
Drawings
Fig. 1 is a schematic diagram of a prior art overheat protection circuit.
Fig. 2 is a schematic structural view of a Type-C connector.
Fig. 3 is a schematic diagram of an overheat protection circuit according to the present invention.
Fig. 4 is a schematic circuit connection diagram of a first control chip according to a preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of a system application of the overheat protection circuit.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Referring to fig. 2, the overheat protection circuit of the USB Type-C connector of the present invention includes a first protection unit and a second protection unit, where the structure of the first protection unit is the same as that of the second protection unit, the first protection unit and the second protection unit are respectively integrated on a first PCB board at a first port of the USB Type-C connector and a second PCB board at a second port of the USB Type-C connector, and the first protection unit and the second protection unit are connected with a power line, a ground line and a channel configuration line of V BUS of the USB Type-C connector, and the first protection unit and the second protection unit are used to detect the temperature of the first port and the temperature of the second port distributed at two ends of the Type-C connector. Because the invention needs to solve the heating problem when the Type-C connector is charged, the charging part of the USB Type-C connector is described at first. The definition of the pins of the USB Type-C connector interface is shown in the following table (table 1):
TABLE 1
Table 1 shows an interface pin diagram of an USB Type-C connector, wherein three differential signals of D (USB 2.0) and TX/RX (USB 3.1) are used for data transmission, CC1/CC2 is a channel configuration pin, and many effects exist, and the following effects are mainly used for the CC1/CC2 pin: detecting connection, distinguishing front and back, distinguishing DFP (Downstream Facing Port) and UFP (Upstream Facing Port), configuring two working modes of V BUS: USB Type-C and USB Power Delivery (PD). V BUS is USB power, GND is ground, SBU is sideband bus.
The USB Type-C connector has five modes of operation when power is transferred, with the USB PD mode of operation having the highest priority. As shown in table 2 below:
TABLE 2
When both the power source end and the device end meet the USB PD protocol, the power transmission is conducted in priority following the PD mode. The USB Type-C connector also satisfies the feature of downward compatibility, i.e., compatibility priority is lower than the USB PD's mode of operation. The second V BUS power line is a power transmission line between the power source end and the device end, and the channel configuration line (CC line) is used for performing communication between the downstream end and the upstream end. The process of the USB Type-C connector from connection to power transfer is as follows:
the method comprises the steps that firstly, an A end power supply of a connector is connected, a B end is connected with electronic equipment, the A end is a downlink end, the B end is an uplink end, and the downlink end can be used for switching on/off a second V BUS power line by controlling MOS (metal oxide semiconductor) tubes M1, M2, M3 and M4;
secondly, according to the insertion direction, the CC1 pin at the downlink end is connected with the CC1 pin at the uplink end through a CC line; the downlink end controls the first switch unit K1 and the second switch unit K2, pins CC1 and CC2 are connected with pull-up resistors Rp1 and Rp2, pins CC1 and CC2 at the uplink end are connected with pull-down resistors Rd1 and Rd2, the downlink end detects the feedback voltage of the pull-down resistor Rd of the uplink end CC line through the CC line and maintains for a period of time (100-200 ms), equipment access is determined, and the downlink end controls VBUS to be conducted; after the uplink detects VBUS, it is determined that there is power supply access
In the third step, the downlink dynamically adjusts the resistance of the first pull-up resistor Rp1, and the different values of the first pull-up resistor Rp1 indicate that the downlink provides different charging currents to the uplink through VBUS, and the downlink determines that the device is in a connection state by detecting the voltage VRd on Rd1 through the pull-down resistor rd1=5.1kΩ on the uplink. The relationship among the current through VBUS, the resistance of pull-up resistor Rp, VRd across pull-down resistor and Vopen is shown in table 3 (where Vopen is the voltage when the device side CC line is floating):
TABLE 3 Table 3
Fourth, the CC2 pin that is not used on the downstream side is connected to VCONN through a switch K2, where VCONN is an internal power signal. Preferably, the first PCB board connection may be provided with eMarker chips. The VCONN is used to power eMarker circuits on the USB Type-C interface, eMarker circuits may implement the electronic tag (Electronically Marked Cable) of the USB Type-C connector to support the USB PD mode. The electronic tag cable can determine important characteristics such as current load capacity of a connecting wire, when both a power supply and equipment obey a USB PD protocol, the downlink end detects the current transmission capacity of the USB Type-C connecting wire through eMarker and declares the power output capacity of the downlink end by periodically sending source_capabilities information to the equipment end; when the power supply end receives a response GoodCRC of the equipment end to source_capabilities, PD communication is confirmed to be established, and the USB Type-C connector works in a USB PD mode to output high power (> 15W);
Fifthly, continuously detecting a pull-down resistor Rd1 at the uplink end by the downlink end to ensure that the equipment is in an access state, and once voltage VRd1 is detected to be more than or equal to Vopen, indicating that the CC line at the uplink end is suspended, disconnecting the equipment, removing power supplies on the V ¬ BUS and the VCONN, and enabling pins CC1 and CC2 to enter a high-resistance state (ZOPEN is more than 126kΩ); after tErrorRecovery =25 ms, the uplink end enters a unattached.snk (sink unconnected) state, the equipment end waits for the access of a power supply, the downlink end enters a unattached.src (source unconnected) state, and the power supply end waits for the access of the equipment;
Sixth, the downlink end detects the pull-down resistor Rd1 of the uplink end again, returns to the second step after waiting for a period of time (10-20 ms), and reenters the charging state, and if the protection unit detects that the port temperature is still too high, the overheat protection action is continued. As shown in fig. 3, the first protection unit of the present invention includes a first control chip IC1, a first resistor R1 and a first thermistor NTC1, the second protection unit includes a second control chip IC2, a second resistor R2 and a second thermistor NTC2, and the first thermistor NTC1 and the second thermistor NTC2 are used for detecting the temperature of the first port and the temperature of the second port of the USB Type-C connector, where:
According to the invention, one end of a first thermistor NTC1, one end of a second thermistor NTC2, a power end VDD of a first control chip IC1 and a power end VDD of a second control chip IC2 are all connected with a V BUS power line of the USB Type-C connector, one end of a first resistor R1, one end of a second resistor R2, a grounding end GND of the first control chip IC1 and a grounding end GND of the second control chip IC2 are all grounded, a temperature detection end VT of the first control chip IC1 is connected with the other end of the first resistor R1 in parallel, a voltage control end V CTR1 of the first control chip IC1 is connected with a channel configuration line of a first port, a temperature detection end VT of the second control chip IC2 is connected with the other end of the second resistor R2 in parallel, and a voltage control end V CTR2 of the second control chip IC2 is connected with the channel configuration line of the second port.
Preferably, the first control chip IC and the second control chip IC2 are powered by the V BUS power line of the USB Type-C connector, and the power supply voltage range is 3.3V-21V.
Preferably, as shown in fig. 4, the first control chip IC1 of the present invention includes an amplifier AMP, a comparator CMP, a low-voltage MOS tube M1, a third resistor R3 and a fourth resistor R4, wherein the in-phase end of the amplifier AMP is connected to an internal reference voltage V REF, the reference voltage V REF is used for comparing with a temperature sampling signal, the output end of the amplifier AMP is connected in parallel to the inverting end of the amplifier and the drain electrode of the low-voltage MOS tube M1, the inverting end of the comparator CMP is connected in parallel to one end of the third resistor R3 and one end of the fourth resistor R4, the in-phase end of the comparator CMP is connected to the temperature detection end VT of the first control chip IC1, the output end of the comparator CMP is connected to the gate of the low-voltage MOS tube M1, the other end of the third resistor R3 is connected to the power supply end VDD of the first control chip IC, the other end of the fourth resistor R4 is connected to the ground end GND of the first control chip IC1, the source of the low-voltage MOS tube M1 is connected to the voltage control end V CTR1 of the first control chip IC1, and the second control chip IC2 has the same structure as the first control chip IC 1.
Preferably, the voltage control terminal VT of the first control chip IC1 and the voltage control terminal VT of the second control chip IC2 are used to output channel voltages for the channel configuration lines, i.e. the CC1 line and the CC2 line, which are greater than 2.75V.
Referring to fig. 5, a overheat protection method using an USB Type-C connector overheat protection circuit includes the steps of:
When the power supply and the equipment are not connected, no voltage exists on a V BUS power line, the first protection unit or the second protection unit does not consume power, and when the power supply and the electronic equipment are respectively connected with the first port and the second port of the USB Type-C connector overheat protection circuit, so that the voltage exists on a second VBUS power line, a channel configuration line CC1 line of the first port continuously detects the feedback voltage on a pull-down resistor Rd1 or a pull-down resistor Rd2 of the second port to ensure that the electronic equipment is in an access state, and a power end and an equipment end are respectively formed.
When the temperature of the first port connected with the power supply, i.e. the power supply end, rises, the first protection unit is used for overheat protecting the power supply end, the temperature detection end VT of the first control chip IC1 acquires the first voltage value V R1 at the two ends of the first resistor R1, compares the acquired first voltage value V R1 with a first preset voltage value, when the first voltage value exceeds the first preset voltage, The voltage control end VT of the first control chip IC1 outputs an interference voltage to a channel configuration line CC of the first port, so that the feedback voltage on a pull-down resistor Rd1 or a pull-down resistor Rd2 of the second port is larger than the suspension voltage of the channel configuration line of the first port, and when the suspension voltage is detected by the channel configuration line of the first port, the electronic equipment is judged to be disconnected, and the first port generates a power removal action, so that overheat protection is realized; That is, as the temperature rises, the first protection unit is configured to overheat-protect the power supply terminal interface, the temperature detection terminal VT of the first control chip IC1 obtains the first voltage value V R1 across the first resistor R1, and compares the obtained first voltage value V R1 with the voltage V R2 across the second resistor R2, The resistance of the first thermistor NTC1 is reduced, the first voltage value V R1 is increased, when the first voltage value V R1 exceeds V R4, the comparator outputs a high level, the low-voltage MOS tube M1 is started, and the source electrode outputs V REF voltage. At this time, the voltage control terminal V CTRL of the first control chip IC1 outputs an interference voltage to the CC line, so that the pull-down voltage V Rd of the second port detected by the CC line of the first port is greater than the voltage when the CC1 pin is suspended, thereby determining that the electronic device is disconnected, and the first port generates a power supply removal operation of V BUS;
When the temperature of the second port connected with the electronic device rises, the temperature detection end of the second control chip IC2 obtains a second voltage value V R2 at two ends of the second resistor R2, compares the obtained second voltage value V R2 with a second preset voltage value, when the second voltage value V R2 exceeds the second preset voltage, the voltage control end of the second control chip IC2 outputs an interference voltage to the channel configuration line CC2 of the second port, so that the feedback voltage of the second port is larger than the suspension voltage of the channel configuration line of the first port, and when the channel configuration line of the first port detects the voltage, the electronic equipment is judged to be disconnected, and the first port generates the action of removing the power supply, thereby realizing overheat protection; that is, when the temperature of the equipment terminal rises, the second protection unit is used for overheat protection of the equipment terminal interface, the temperature detection terminal VT of the second control chip IC2 of the overheat protection unit obtains the first voltage value V R2 at two ends of the second resistor R2, compares the obtained second voltage value V R2 with the voltage V R4 at two ends of the fourth resistor R4, As the temperature increases, the resistance of the second thermistor NTC2 decreases, the second voltage V R2 increases, and when the second voltage V R2 exceeds V R4, the comparator outputs a high level, the low-voltage MOS transistor M1 is turned on, and the source outputs a voltage V REF. At this time, the voltage control terminal V CTRL of the second control chip IC2 outputs an interference voltage to the CC line, so that the pull-down voltage V Rd of the second port detected by the CC line of the first port is greater than the voltage when the CC1 pin is suspended, thereby determining that the electronic device is disconnected, and the first port generates a power supply removal operation of V BUS;
then, the first port enters a state of waiting for equipment connection and is kept for a period of time (10-20 ms), after detecting the feedback voltage of the pull-down resistors Rd1 and Rd2 of the second port and keeping for a period of time (100-200 ms), connection between the power supply and the electronic equipment is reestablished, and if the protection unit still detects that the temperature of the connector port is too high at the moment, overheat protection is continued. The access waiting time and the judging time of the USB Type-C connector can generate protective hysteresis control so as to avoid quick disconnection of the charging process, and therefore the port temperature of the connector is effectively reduced.
When overheat protection is carried out, the access waiting time and the judging time of the USB Type-C connector produce hysteresis control for protection so as to avoid quick disconnection of the charging process, and therefore the temperature of the first port and the temperature of the second port of the USB Type-C connector are effectively reduced.
According to the invention, based on the USB Type-C connector, the specification of the USB Type-C system is utilized, when the interface temperature of the USB Type-C connector is too high, the connection condition between a power supply and equipment is changed through the control chip, so that the system automatically cuts off a power supply loop, and the purpose of overheat protection is achieved, and the USB Type-C connector is simple, reliable and high in practicability; no extra pressure drop is generated on the USB Type-C connecting line, and the system efficiency is high; the protection unit has simple structure, small volume, low cost and easy integration, and does not need to use a high-voltage power tube.
The present invention has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the invention based on the above description. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Accordingly, certain details of the illustrated embodiments are not to be taken as limiting the invention, which is defined by the appended claims.
Claims (5)
1. The overheat protection circuit of the USB Type-C connector is characterized by comprising a first protection unit and a second protection unit, wherein the structure of the first protection unit is symmetrical to that of the second protection unit, the first protection unit and the second protection unit are respectively integrated on a first PCB (printed Circuit Board) at a first port of the USB Type-C connector and a second PCB (printed Circuit Board) at a second port of the USB Type-C connector, the first protection unit and the second protection unit are connected with a V BUS power line, a ground line and a channel configuration line of the USB Type-C connector, and the first protection unit and the second protection unit are used for detecting the temperature of the first port and the temperature of the second port distributed at two ends of the Type-C connector;
The first protection unit includes first control chip, first resistance and first thermistor, the second protection unit includes second control chip, second resistance and second thermistor, first thermistor with second thermistor is used for surveying the temperature of Type-C connector the first port with the temperature of second port, wherein:
One end of the first thermistor, one end of the second thermistor, a power end of the first control chip and a power end of the second control chip are all connected with the V BUS power line of the USB Type-C connector, one end of the first resistor, one end of the second resistor, a grounding end of the first control chip and a grounding end of the second control chip are all grounded, a temperature detection end of the first control chip is connected with the other end of the first resistor and the other end of the first thermistor in parallel, a voltage control end of the first control chip is connected with a channel configuration line of the first port, a temperature detection end of the second control chip is connected with the other end of the second resistor and the other end of the second thermistor in parallel, and a voltage control end of the second control chip is connected with the channel configuration line of the second port;
the first control chip and the second control chip are powered by the V BUS power line of the USB Type-C connector, and the power supply voltage range is between 3.3V and 21V;
The voltage control end of the first control chip and the voltage control end of the second control chip are used for outputting channel voltage for the channel configuration line, and the channel voltage is greater than 2.75V.
2. The USB type-C connector overheat protection circuit of claim 1, wherein the first control chip includes an amplifier, a comparator, a low voltage MOS tube, a third resistor and a fourth resistor, the in-phase end of the amplifier is connected to an internal reference voltage, the reference voltage is used to compare with a temperature sampling signal, the output end of the amplifier is connected in parallel to the inverting end of the amplifier and the drain electrode of the low voltage MOS tube, the inverting end of the comparator is connected in parallel to one end of the third resistor and one end of the fourth resistor, the in-phase end of the comparator is connected to the temperature detecting end of the first control chip, the output end of the comparator is connected to the gate electrode of the low voltage MOS tube, the other end of the third resistor is connected to the power end of the first control chip, the other end of the fourth resistor is connected to the ground end of the first control chip, the source electrode of the low voltage MOS tube is connected to the voltage control end of the first control chip, and the structure of the second control chip is the same as the first control chip.
3. The USB Type-C connector overheat protection circuit of claim 2, wherein when there is a eMarker chip at the USB Type-C connector port, the first protection unit or the second protection unit is further integrated on eMarker chip.
4. A method of overheat protection for an USB Type-C connector overheat protection circuit according to claims 1 to 3, comprising the steps of:
Connecting a power supply and electronic equipment to the first port and the second port of the USBType-C connector overheat protection circuit respectively, so that voltage exists on the V BUS power supply line, and continuously detecting the feedback voltage of the second port by a channel configuration line of the first port to ensure that the electronic equipment is in an access state;
when the temperature of a first port connected with the power supply rises, the temperature detection end of the first control chip acquires a first voltage value at two ends of the first resistor, compares the acquired first voltage value with a first preset voltage value, and outputs an interference voltage to the channel configuration line of the first port when the first voltage value exceeds the first preset voltage, so that the feedback voltage of the second port is larger than the suspension voltage of the channel configuration line of the first port, and after the channel configuration line of the first port detects the suspension voltage, the first port is judged to be disconnected, and the power supply is removed, so that overheat protection is realized; when the temperature of the second port connected with the electronic device rises, the temperature detection end of the second control chip obtains a second voltage value at two ends of the second resistor, compares the obtained second voltage value with a second preset voltage value, when the second voltage value exceeds the second preset voltage, the voltage control end of the second control chip outputs an interference voltage to the channel configuration line of the second port, so that the feedback voltage of the second port is larger than the suspension voltage of the channel configuration line of the first port, and when the channel configuration line of the first port detects the voltage, the electronic device is judged to be disconnected, and the first port generates the action of removing the power supply, thereby realizing overheat protection.
5. The overheat protection method of the overheat protection circuit of the USB Type-C connector of claim 4, wherein the access waiting time and the judgment time of the USB Type-C connector generate a protection hysteresis control to avoid rapid disconnection of the charging process, thereby reducing the temperature of the one port and the temperature of the second port of the connector when overheat protection is performed.
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| US11233386B2 (en) * | 2019-02-27 | 2022-01-25 | Google Llc | USB Type-C port short protection |
| CN110277700B (en) * | 2019-06-18 | 2020-11-13 | 维沃移动通信有限公司 | A kind of interface unit |
| CN110602298A (en) * | 2019-09-24 | 2019-12-20 | 上海南芯半导体科技有限公司 | Method for effectively detecting overheat burning of USB C port of mobile phone |
| US11269390B2 (en) | 2020-06-26 | 2022-03-08 | Alpha And Omega Semiconductor International Lp | Port controller with real-time fault detection |
| CN112736860B (en) * | 2021-01-25 | 2023-04-07 | 深圳慧能泰半导体科技有限公司 | Fault protection circuit of USB cable and USB cable thereof |
| CN112838566B (en) * | 2021-04-21 | 2021-07-23 | 珠海智融科技有限公司 | Over-temperature protection circuit, method and system for Type-C interface |
| CN113784247B (en) * | 2021-08-30 | 2024-08-30 | 维沃移动通信有限公司 | Electronic equipment, earphone patch cord and electronic equipment assembly |
| CN113937845A (en) * | 2021-09-15 | 2022-01-14 | 华为技术有限公司 | Charging system, charged device and port protection method |
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